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Temperature trends and elevation dependent warming during 1965-2014 in headwaters of Yangtze River, Qinghai Tibetan Plateau

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Journal of Mountain Science 2020年第3期17卷 556-571页

作者： Naveed AHMED WANG Gen-xu adeyeri oluwafemi Sarfraz MUNIR HU Zhao-yong Aamir SHAKOOR Muhammad Ali IMRAN Key Laboratory of Mountain Surface Process and Ecological Regulations Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China Institute for Meteorology and Climate Research Atmospheric Environmental Research Karlsruhe Institute of TechnologyCampus Alpine82467Germany Water Resources Engineering University of Kurdistan Hewler 30 Meter Avenue ErbilKurdistan44001Iraq Department of Agricultural Engineering Bahauddin Zakariya UniversityMultan66000Pakistan Beijing Key Laboratory of Water Resources and Environmental Engineering China University of GeosciencesBeijing 100083China

The understanding of temperature trends in high elevation mountain areas is an integral part of climate change research and it is critical for assessing the impacts of climate change on water resources including glacier melt, degradation of soils, and active layer thickness. In this study, climate changes were analyzed based on trends in air temperature variables(Tmax, Tmin, Tmean), and Diurnal Temperature Range(DTR) as well as elevation-dependent warming at annual and seasonal scales in the Headwaters of Yangtze River(HWYZ), Qinghai Tibetan Plateau. The Base Period(1965-2014) was split into two subperiods;Period-Ⅰ(1965-1989) and Period-Ⅱ(1990-2014) and the analysis was constrained over two subbasins;Zhimenda and Tuotuohe. Increasing trends were found in absolute changes in temperature variables during Period-Ⅱ as compared to Period-Ⅰ.Tmax, Tmin, and Tmean had significant increasing trends for both sub-basins. The highest significant trends in annual time scale were observed in Tmin(1.15℃ decade-1) in Tuotuohe and 0.98℃ decade-1 in Zhimenda sub-basins. In Period-Ⅱ, only the winter season had the highest magnitudes of Tmax and Tmin0.58℃ decade-1 and 1.26℃ decade-1 in Tuotuohe subbasin, respectively. Elevation dependent warming analysis revealed that Tmax, Tmin and Tmean trend magnitudes increase with the increase of elevations in the middle reaches(4000 m to 4400 m) of the HWYZ during Period-Ⅱ annually. The increasing trend magnitude during Period-Ⅱ, for Tmax, is 1.77, 0.92, and 1.31℃ decade-1, for Tmin 1.20, 1.32 and 1.59℃ decade-1,for Tmean 1.51, 1.10 and 1.51℃ decade-1 at elevations of4066 m, 4175 m and 4415 m respectively in the winter season. Tmean increases during the spring season for> 3681 m elevations during Period-Ⅱ, with no particular relation with elevation dependency for other variables. During the summer season in Period Ⅱ, Tmax, Tmin, Tmean increases with the increase of elevations(3681 m to 4415 m) in the middle reaches of HWYZ. Elevation dependent wa

关键词： Climate change Elevation dependent warming Mann Kendall Temperature trends Yangtze River Qinghai Tibetan Plateau

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A distributed modeling approach to water balance implications from changing land cover dynamics in permafrost environments

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Geography and Sustainability 2024年第4期5卷 561-576页

作者： Naveed Ahmed Haishen Lu Zhongbo Yu oluwafemi E.adeyeri Muhammad Shahid Iqbal Jinbin Su The National Key Laboratory of Water Disaster Prevention College of Hydrology and Water ResourcesHohai UniversityNanjing 210098China College of Hydrology and Water Resources Hohai UniversityNanjing 210098China School of Energy and Environment City University of Hong KongKowloonHong Kong Special Administrative Regions of China Australian Rivers Institute Griffith UniversityNathanQLD 4111Australia International Water Management Institute(IWMI) Lahore 54000Pakistan National Tibetan Plateau Data Center State Key Laboratory of Tibetan Plateau Earth SystemEnvironment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

There is 78%permafrost and seasonal frozen soil in the Yangtze River’s Source Region(SRYR),which is situated in the middle of the Qinghai-Xizang *** distinct scenarios were developed in the Soil and Water Assessment Tool(SWAT)to model the effects of land cover change(LCC)on various water balance *** and percolation of groundwater have decreased by *** demonstrates the seasonal contributions of subsurface water,which diminish when soil *** winter,when surface water inputs are low,groundwater storage becomes even more critical to ensure water supply due to this periodic *** impermeable layer underneath the active layer thickness decreases GWQ and PERC in LCC+permafrost *** water transport and storage phase reached a critical point in August when precipitation,permafrost thawing,and snowmelt caused LATQ to *** prevent waterlogging and save water for dry periods,it is necessary to control this peak flow *** processes,permafrost dynamics,and land cover changes in the SRYR are difficult,according to the *** interactions enhance water circulation throughout the year,recharge of groundwater supplies,surface runoff,and lateral *** the region’s water resource management to be effective in sustaining ecohydrology,ensuring appropriate water storage,and alleviating freshwater scarcity,these dynamics must be considered.

关键词： Cold region Land cover change Permafrost hydrology SWAT model Source region Yangtze river

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